Searching for Excess Noise in Suspensions

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Presentation transcript:

Searching for Excess Noise in Suspensions Andri M. Gretarsson Livingston Observatory LIGO-G040188-00-Z

How are resonances useful? Provide information about suspension-induced broadband signals (“creaks”). May report on unexpected high frequency coil activity. In prototype suspensions, look for excess mechanical noise at the level of the thermal noise.

Detecting creaks – First step: Heterodyne Detecting creaks – First step: Heterodyne! this page: Fake data set with no thermal noise bw = 1 Hz

Energy Innovation Mode amplitude and phase drift: For random driving: are Gaussian distributed. Define the Energy Innovation, : is: Exponential distributed. Especially sensitive to sudden changes in the resonant mode amplitude or phase.

Creaks show up as outliers in this page: Fake data set with no thermal noise. Event Exponential Histogram Event

Compare

Mode Amplitude LLO violin mode Syracuse tungsten fiber bw = 10 Hz

Energy Innovation LLO violin mode Syracuse tungsten fiber bw = 10 Hz

Correlations Look for Correlations between events: Between modes of the same wire Between identical modes of wires attached to same test mass Between modes of wires attached to the different test masses Between modes and nearby non-resonant frequencies

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